<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    li{
        height: 30px;
        background-color: blue;
        margin-top: 20px;
    }
</style>
<body>
    <ul id="parent">
        <li>html</li>
        <li>css</li>
        <li>js</li>
    </ul>
    <script>
        var parent = document.getElementById("parent");
        parent.onclick = function(event){
            console.log(event.target)
        }
    </script>
</body>
</html>